How to check if a field is empty in SQL?

1 year ago

Ava Mitchell

1 minute

In SQL, you can use IS NULL or IS NOT NULL to determine if a field is empty.

If you want to determine if a field is empty, you can use the following syntax:

SELECT * FROM 表名 WHERE 字段名 IS NULL;

To check if a field is not empty, you can use the following syntax:

SELECT * FROM 表名 WHERE 字段名 IS NOT NULL;

The table name is the name of the table to be queried, and the field name is the name of the field to be checked for emptiness.